John F. Deasy

John F. Deasy: Attorney with Marshall Dennehey
  • Shareholder at Marshall Dennehey
  • Union Trust Building, 501 Grant Street, Suite 700, Pittsburgh, PA 15219
    View John F. Deasy's office location
  • John F. Deasy is a shareholder with Marshall, Dennehey, Warner, Coleman & Goggin. He is a member of the firm's Casualty Department and concentrates his practice in the area of general liability including premises liability; sports, amusements, and entertainment liability; product liability; liquor liability; transportation liability; and insurance fraud.

  • Overall Rating

    4.5
    .
    13 Reviews

  • Overall Rating

    4.5
    .
    13 Reviews

    Peer Reviews

    4.5
    .
    13

    Peer Reviews

    4.5
    .
    13
  • Profile Visibility [ i ]
    • #368 in weekly profile views out of 13,283 Attorneys in Pittsburgh, PA
    • #56,455 in weekly profile views out of 2,346,351 total attorneys Overall
Attorney Awards
  • Martindale-Hubbell Peer AV Preeminent Rating
About Attorney Awards

Biography

John practices in the firm's Casualty Department. He concentrates his practice in the area of general liability including premises liability, product liability, construction accident and defects, fire and explosions, amusements, sports and entertainment liability, liquor liability, auto, and trucking and transportation litigation. Additionally, John has experience in cases involving elevators, escalators, moving walkways, electronic doorways, cranes and lifts.

An active trial attorney since 1992, he has represented property owners and managers of large shopping malls, sports and entertainment centers, amusement parks, stadiums, arenas, office buildings, residential complexes, hotels, bars and restaurants.

John has represented project owners, contractors, trucking companies, bus companies, highway contractors and parking garage owners and operators along with product manufacturers, distributors and retailers including department stores. He has also represented many small business owners such as barber shops, auto repairs shops and sub-contractors.

John has practiced and tried cases in many of the state courts in western Pennsylvania and federal court. John received a Bachelor of Arts in Political Science from the University of Pittsburgh in 1987. In 1991, he received his juris doctor from the University of Pittsburgh School of Law.

Honors & Awards

•AV Preeminent by Martindale-Hubbell
•The Best Lawyers in America, Personal Injury Litigation - Defendants; Product Liability Litigation - Defendants (2025-2026)
•Pennsylvania Super Lawyers (2017-2019)

Classes/ Seminar Taught

•Defending Roller Skating Claims, Roller Skating Association (RSA) Chapter Meeting, Pittsburgh, PA, October 24,, 2022

Published Works

•“Pennsylvania’s Relaxed Standard for Proving Intoxication in Civil Cases,” Defense Digest, December 2018, Vol. 24, No. 4

News

98 Marshall Dennehey Attorneys Recognized in the 2026 Editions of The Best Lawyers in America and the Best Lawyers: Ones to Watch in America

August 20, 2025

See more ›

Areas of Practice (5)

  • Amusements, Sports & Recreation Liability
  • General Liability
  • Product Liability
  • Hospitality & Liquor Liability
  • Trucking & Transportation Liability

Education & Credentials

University Attended:
University of Pittsburgh, B.A., Political Science, 1987
Law School Attended:
University of Pittsburgh School of Law, Pittsburgh, Pennsylvania, J.D., 1991
Year of First Admission:
1991
Admission:
1991, Pennsylvania; 1991, U.S. District Court Western District of Pennsylvania; U.S. Court of Appeals 3rd Circuit
Memberships:

Associations & Memberships

Allegheny County Bar Association

Reported Cases:
Representative Cases & Matters: Obtained summary judgment in a wrongful death/survival action arising from a fatal shooting, resulting in dismissal of all claims against their clients, the alleged shooter and his employer. The case stemmed from a remodeling dispute in which the decedent confronted one of the defendants, threatened him, and pointed a gun at him, after which the defendant shot the decedent in self-defense. The court granted summary judgment based on a Lamp v. Heyman argument, finding the plaintiff failed to timely and diligently serve the defendants before the statute of limitations expired. The court also granted summary judgment to Wesley and Sylvia Deaderick on corporate veil grounds and to Deaderick Enterprises, Inc., holding there was no basis for vicarious or direct liability because the shooting was outside the scope of employment and no negligent training or supervision was established.
ISLN:
900105331

Peer Reviews

4.5/5.0 (13 reviews)
Martindale-Hubbell® AV Preeminent Rating Badge

  • Legal Knowledge

    4.5/5.0

  • Analytical Capability

    4.4/5.0

  • Judgment

    4.5/5.0

  • Communication

    4.5/5.0

  • Legal Experience

    4.7/5.0
Peer reviews submitted prior to 2008 are not displayed.

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